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A260831 as a simple table

na(n)
15
27
359
479
597
6557
7577
8599
9757
10797
11977
12997
135557
145779
157559
167577
177757
187759
1955579
2055799
2155997
2257557
2357559
2457977
2559557
2659779
2759797
2859957
2959999
3075557
3175577
3275797
3375979
3475997
3577557
3677797
3777977
3877999
3979559
4079579
4179757
4279777

[5,7,59,79,97,557,577,599,757,797,977,997,5557,
 5779,7559,7577,7757,7759,55579,55799,55997,57557,
 57559,57977,59557,59779,59797,59957,59999,75557,
 75577,75797,75979,75997,77557,77797,77977,77999,
 79559,79579,79757,79777]